8.1.9 Technical data
Table 89: OC4PTOC technical data
Function
Setting range Accuracy
Operate current (5-2500)% of
lBase
± 1.0% of I
r
at I ≤ I
r
± 1.0% of I at I > I
r
Reset ratio > 95% at (50–2500)% of
lBase
-
Min. operating current (5-10000)% of
lBase
± 1.0% of I
r
at I ≤ I
r
±1.0% of I at I > I
r
2nd harmonic blocking (5–100)% of fundamental
± 2.0% of I
r
Independent time delay (0.000-60.000) s
± 0.5% ±25 ms
Minimum operate time for
inverse characteristics
(0.000-60.000) s
± 0.5% ±25 ms
Inverse characteristics, see
table 574, table 575 and table
576
15 curve types
1)
ANSI/IEEE C37.112
IEC 60255–151
±3% or ±40 ms
0.10 ≤ k ≤ 3.00
1.5 x I
set
≤ I ≤ 20 x I
set
Operate time, nondirectional
start function
25 ms typically at 0 to 2 x I
set
-
Reset time, nondirectional start
function
35 ms typically at 2 to 0 x I
set
-
Operate time, directional start
function
50 ms typically at 0 to 2 x I
set
-
Reset time, directional start
function
35 ms typically at 2 to 0 x I
set
-
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Impulse margin time 15 ms typically -
1)
Note: Timing accuracy only valid when 2nd harmonic blocking is turned off
8.2 Four step residual overcurrent protection, zero,
negative sequence direction EF4PTOC
8.2.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Four step residual overcurrent
protection, zero or negative sequence
direction
EF4PTOC
IEC11000263 V1 EN
51N/67N
Section 8 1MRK 502 048-UEN A
Current protection
186
Technical manual
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